// 导航栏的Mapper
var NavigationBarRouteMapper = {
  // 左键
  LeftButton(route, navigator, index, navState) {
    // ...
  },
  // 右键
  RightButton(route, navigator, index, navState) {
    // ...
  },
  // 标题
  Title(route, navigator, index, navState) {
    return (
      <View style={styles.navContainer}>
        <Text style={styles.title}>
          应用标题
        </Text>
      </View>
    );
  }
};
